curl --request POST \
  --url https://integration.getmateo.com/api/v1/contact_custom_field \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "custom_field_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "created_at": "now()",
  "updated_at": "now()",
  "organisation_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "key": "<string>",
  "value": "<string>",
  "date_value": "2023-12-25",
  "string_value": "<string>",
  "number_value": 123,
  "boolean_value": true,
  "datetime_value": "<string>",
  "string_list_value": [
    "<string>"
  ]
}
'

import requests

url = "https://integration.getmateo.com/api/v1/contact_custom_field"

payload = {
    "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "custom_field_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "created_at": "now()",
    "updated_at": "now()",
    "organisation_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "key": "<string>",
    "value": "<string>",
    "date_value": "2023-12-25",
    "string_value": "<string>",
    "number_value": 123,
    "boolean_value": True,
    "datetime_value": "<string>",
    "string_list_value": ["<string>"]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    contact_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    custom_field_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    created_at: 'now()',
    updated_at: 'now()',
    organisation_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    key: '<string>',
    value: '<string>',
    date_value: '2023-12-25',
    string_value: '<string>',
    number_value: 123,
    boolean_value: true,
    datetime_value: '<string>',
    string_list_value: ['<string>']
  })
};

fetch('https://integration.getmateo.com/api/v1/contact_custom_field', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://integration.getmateo.com/api/v1/contact_custom_field",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'contact_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'custom_field_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'created_at' => 'now()',
    'updated_at' => 'now()',
    'organisation_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'key' => '<string>',
    'value' => '<string>',
    'date_value' => '2023-12-25',
    'string_value' => '<string>',
    'number_value' => 123,
    'boolean_value' => true,
    'datetime_value' => '<string>',
    'string_list_value' => [
        '<string>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://integration.getmateo.com/api/v1/contact_custom_field"

	payload := strings.NewReader("{\n  \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"custom_field_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"created_at\": \"now()\",\n  \"updated_at\": \"now()\",\n  \"organisation_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"key\": \"<string>\",\n  \"value\": \"<string>\",\n  \"date_value\": \"2023-12-25\",\n  \"string_value\": \"<string>\",\n  \"number_value\": 123,\n  \"boolean_value\": true,\n  \"datetime_value\": \"<string>\",\n  \"string_list_value\": [\n    \"<string>\"\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://integration.getmateo.com/api/v1/contact_custom_field")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"custom_field_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"created_at\": \"now()\",\n  \"updated_at\": \"now()\",\n  \"organisation_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"key\": \"<string>\",\n  \"value\": \"<string>\",\n  \"date_value\": \"2023-12-25\",\n  \"string_value\": \"<string>\",\n  \"number_value\": 123,\n  \"boolean_value\": true,\n  \"datetime_value\": \"<string>\",\n  \"string_list_value\": [\n    \"<string>\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://integration.getmateo.com/api/v1/contact_custom_field")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"contact_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"custom_field_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"created_at\": \"now()\",\n  \"updated_at\": \"now()\",\n  \"organisation_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"key\": \"<string>\",\n  \"value\": \"<string>\",\n  \"date_value\": \"2023-12-25\",\n  \"string_value\": \"<string>\",\n  \"number_value\": 123,\n  \"boolean_value\": true,\n  \"datetime_value\": \"<string>\",\n  \"string_list_value\": [\n    \"<string>\"\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "custom_field_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "created_at": "now()",
  "updated_at": "now()",
  "organisation_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "key": "<string>",
  "value": "<string>",
  "date_value": "2023-12-25",
  "string_value": "<string>",
  "number_value": 123,
  "boolean_value": true,
  "datetime_value": "<string>",
  "string_list_value": [
    "<string>"
  ]
}

{
  "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "custom_field_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "created_at": "now()",
  "updated_at": "now()",
  "organisation_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "key": "<string>",
  "value": "<string>",
  "date_value": "2023-12-25",
  "string_value": "<string>",
  "number_value": 123,
  "boolean_value": true,
  "datetime_value": "<string>",
  "string_list_value": [
    "<string>"
  ]
}

This response has no body data.